, connecticut. >>> we have developing news tonight in san francisco where a standoff is now underway with a man and possibly a hostage. that has led to the evacuation of a residential building where the man is hold up. jade hernandez is live at california and larkin with late details. jade? >> ken, police say a man who's threatening he has a weapon is refusing to come outside his apartment. traffic is being diverted from california to larkin and the streets between larkin and hyde are closed. no pedestrian traffic is being allowed through at this hour. 30 minutes ago, san francisco police spokesman told us a hostage negotiator is out here. the department has a s.w.a.t. team and their technical command post set up. police cannot confirm whether or not this man has a person inside the apartment with him. but let's take a look at the video we captured earlier when we arrived, which was shortly after police arrived here in the 1400 block of california. officer carlos tells us dispatchers received a call about 6:30 this evening from a man who told them he had overheard a domestic dispute next door.